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When Light Reveals the Reality We Cannot See: A Modern Reassessment of First-Order Experiments

Author:

SAVOURET, Aime

Category:

Research Papers

Sub-Category:

Relativity Theory

Language:

English

Date Published:

December 11, 2025

File:

/Research Papers-Relativity Theory/Download/10392

Downloads:

Keywords:

Light propagation, Fresnel drag, Bradley observations, Fizeau experiment, Hoek experiment, first-order effects, interferometry, refractive media, Doppler phase shift, relativistic frames, absolute motion, Sagnac effect, embedded light source, ether drag

Abstract:

This work revisits how light behaves when it travels through a moving refractive medium and questions whether an embedded light source truly erases all traces of motion. Classical tests of relativity, Michelson, Hoek, or modern variants, suppress first-order effects by design, revealing only second-order signatures. Here, the entire interferometric setup is placed on a moving vehicle to search for a linear, velocity-dependent fringe shift predicted in a pre-relativistic framework through Fresnel drag or light–matter coupling. The experiment also considers the possible Doppler phase imprint of a moving source and emphasizes the need for precise path-length compensation to eliminate parasitic shifts. Moreover, this approach opens the possibility of probing the anisotropy of space itself, as any directional dependence in the measured signal could reveal subtle asymmetries in light propagation. A measurable first-order signal would suggest that propagation in real media retains sensitivity to the inertial state of the source, hinting at limits in how relativity describes optical interactions in matter. Even a null result would be valuable, as it probes an almost unexplored setup of light propagation and provides constraints on potential spatial anisotropies.